Universität zu Köln

Hess, Melissa ORCID: 0000-0002-9255-7185, Gratz, Micha, Remmer, Hilke, Webers, Samira, Landers, Joachim, Borin, Dmitry, Ludwig, Frank, Wende, Heiko ORCID: 0000-0001-8395-3541, Odenbach, Stefan, Tschoepe, Andreas and Schmidt, Annette M. (2020). Scale-dependent particle diffusivity and apparent viscosity in polymer solutions as probed by dynamic magnetic nanorheology. Soft Matter, 16 (32). S. 7562 - 7576. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 1744-6848

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Abstract

In several upcoming rheological approaches, including methods of micro- and nanorheology, the measurement geometry is of critical impact on the interpretation of the results. The relative size of the probe objects employed (as compared to the intrinsic length scales of the sample to be investigated) becomes of crucial importance, and there is increasing interest to investigate the dynamic processes and mobility in nanostructured materials. A combination of different rheological approaches based on the rotation of magnetically blocked nanoprobes is used to systematically investigate the size-dependent diffusion behavior in aqueous poly(ethylene glycol) (PEG) solutions with special attention paid to the relation of probe size to characteristic length scales within the polymer solutions. We employ two types of probe particles: nickel rods of hydrodynamic lengthL(h)between 200 nm and 650 nm, and cobalt ferrite spheres with diameterd(h)between 13 nm and 23 nm, and examine the influence of particle size and shape on the nanorheological information obtained in model polymer solutions based on two related, dynamic-magnetic approaches. The results confirm that as long as the investigated solutions are not entangled, and the particles are much larger than the macromolecular correlation length, a good accordance between macroscopic and nanoscopic results, whereas a strong size-dependent response is observed in cases where the particles are of similar size or smaller than the radius of gyrationR(g)or the correlation length xi of the polymer solution.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hess, Melissa UNSPECIFIED orcid.org/0000-0002-9255-7185 UNSPECIFIED Gratz, Micha UNSPECIFIED UNSPECIFIED UNSPECIFIED Remmer, Hilke UNSPECIFIED UNSPECIFIED UNSPECIFIED Webers, Samira UNSPECIFIED UNSPECIFIED UNSPECIFIED Landers, Joachim UNSPECIFIED UNSPECIFIED UNSPECIFIED Borin, Dmitry UNSPECIFIED UNSPECIFIED UNSPECIFIED Ludwig, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED Wende, Heiko UNSPECIFIED orcid.org/0000-0001-8395-3541 UNSPECIFIED Odenbach, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Tschoepe, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmidt, Annette M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-322478
DOI:	10.1039/c9sm00747d
Journal or Publication Title:	Soft Matter
Volume:	16
Number:	32
Page Range:	S. 7562 - 7576
Date:	2020
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	1744-6848
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STOKES-EINSTEIN RELATION; TRACKING MICRORHEOLOGY; POLYETHYLENE-GLYCOL; NI NANORODS; NANOPARTICLES; SEMIDILUTE; SCATTERING; BREAKDOWN; BEHAVIOR Multiple languages Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Multidisciplinary; Polymer Science Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32247